Precision Magnesium is a well-balanced supplement that is designed to raise and maintain magnesium levels as well as enhance coral growth. This product contains 80,000 ppm (mg/L) of magnesium and is one of the strongest magnesium supplements on the market. Proper Magnesium levels will aid in maintaining proper calcium levels, which are essential for the optimal growth of hard and soft corals, clams, coralline algae and other invertebrates. In addition, magnesium is important for optimal buffering capacity and maintaining the ionic balance of the aquarium. This helps to maintain a stable eco-system and stress free animals. Precision Magnesium does not contain polygluconates, lactates, phosphates or nitrates, which can cause unwanted algae, slime and bacterial growth. Precision Magnesium is made with high quality (USP Grade) chemicals, which ensures you will not be adding unwanted amounts of metals or organics to your aquarium. 1 capful (.17oz or 5mL) of Precision Magnesium in 25 gallons (94.5 liters) will increase magnesium levels by approximately 5 ppm (mg/L).